Hello there. I have transfered bit of ONT tokens from O3 into new NEON wallet. It was confirmed, have checked ont.io explorer, but it doesn’t show up in balance. Then I was told that this happened because each has it’s own mainnet. Is that true, and can it be reversed? Thank you for response.

Indeed, NEO and Ontology have a separate chain. NEON wallet is a NEO only wallet, so it does not show assets on the Ontology blockchain. O3 supports both NEO and Ontology.

What you can do, is you can get your wallet backup file from NEON wallet and import it into O3 (see settings menu). Then you can access the NEON wallet on O3. You can keep it as a separate wallet or send back the funds to your original wallet if you like.